@nola/ast-designer

## How to start 0. packages目录下ast,designer,preview,shell,fs,scaff-dev,scaff-run目录都需要执行```npm install``` 1. 进 designer 目录执行 ```yarn link``` 2. 进 ast 目录执行 ```yarn link``` 3. 进 preview 目录执行 ```yarn link @nola/ast-designer``` 和 ```yarn link @nola/ast``` 4. 进